Minolta Di 620 Manual page 49

2) Manual Density Control
•
If the copier is set to manual density mode, the user can set copy density to any of
nine settings (or "steps") at the control panel (touch panel).
•
Based on the user's setting, the CPU of the PWB-IB transmits a predetermined
background removal threshold value to the IR Density Correction block, which
then implements density correction accordingly.
PWB-J
PWB-L
PH
Section
Copy
•
The control flow during manual density mode is described below.
The user selects manual density mode at the touch panel, and then sets the
density level ("step").
The step setting is transmitted through the Memory board to the Digital Image
Processing Board.
The CPU on the Digital Image Processing board finds the background
removal threshold value that corresponds to the step setting.
Original
Lens
PWB-B
Memory
To ¿ on next page.
M-30
Original placement
CCD
Sensor
PWB-IA
PWB-IB
IR density
correction
CPU
PWB-B
AUTO
Control Panel
1155M105CA